package com.heima.admin.gateway.filter;


import com.heima.admin.gateway.util.AdminJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;



@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    //过滤请求
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取请求和响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断是否为登录请求
        String uri = request.getURI().getPath();
        if (uri.contains("login")) {
            //如果是登录请求,就放行
            return chain.filter(exchange);
        }


        //3.获取token
        String token = request.getHeaders().getFirst("token");

        //4.判断token是否存在
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5.判断token是否有效
        try {
            Claims claimsBody = AdminJwtUtil.getClaimsBody(token);
            //是否是过期
            int result = AdminJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //获得到用户的数据
            Object userId = claimsBody.get("id");

            //存放到request的header中
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", userId + "")).build();

            //路由到具体的微服务访问，重置request请求，才能生效
            exchange.mutate().request(serverHttpRequest).build();


        } catch (Exception e) {
            e.printStackTrace();
        }

        return chain.filter(exchange);
    }


    @Override
    public int getOrder() {
        return -1;
    }
}
